Q: The L3 cache is disabled in Vista 64 (even if it is enabled in BIOS) causing the CPU to run signifugantly slower certain applications. What to do to enable it?
A: Are you sure? Do this first : Download CPU-Z and check if the program detects the correct amount on L3 cache. If it is. Then it is working correctly. http://www.cpuid.com/cpuz.php However, if you are thinking of the TLB fix Microsoft included with the Vista SP1 patch. You can do this to remove it and thus get improved performance. http://www.xtremesystems.org/forums/showthread.php?t=180338 PS. If you're thinking that 4 cores mean 4X the performance in games, you're wrong sadly. You're even lucky to get 50% performance because most games don't even support dual cores.